多數(shù)斷路器控制回路中,跳閘線圈和斷路器輔助接點(用于在斷路器跳閘后切斷電流)相串聯(lián),以防止對弱電接點造成損害。這可以通過監(jiān)視斷路器輔助接點(斷路器跳閘后打開)來實現(xiàn)。但是，由于斷路器輔助接點狀態(tài)改變和跳閘回路電流中斷之間存在時差，該方案可能作出錯誤操作。啟動接點最可靠的保護方法是直接測量跳閘回路中的電流，用測量得出的參數(shù)去控制復(fù)歸啟動繼電器。這個保護方案通常被稱為跳閘封鎖。

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